ADU Room Additions

// What is an


Accessory Dwelling Units or “ADUs” are dwellings—either attached or detached from the main house—that legally exist on the same lot with another house, and in many cases inside the main home. ADUs can create secondary rental income, while increasing the occupancy of a given plot of land, thus creating more walkable cities, while still providing autonomy and privacy for both homes.

We'll Build You a Beautiful ADU

Homeowners now have more freedom to adapt their existing homes to fit changing needs and generate rental income.
Cosmic Renovation & Roofing is a design-build firm that uses an integrated project delivery method; for you, this means a safely built, quality rental unit that is legal and code compliant.
ADUs are becoming more popular due to updated housing regulations and their valuable versatility for homeowners. They offer private living space such as guest suites, or living options for elderly parents or young adults. As rental units, they generate income while increasing the walkability of our communities in a responsible and economical way.
Additions ADU (16)
// In California

Home Additions

Home additions, when built with expertise, have the power to enhance your home’s value and extend its square footage. Although doing so may be considered a large investment, the end results will add value to your property. Choosing Cosmic can help with your goals of extending your home to create the additional space you desire.
Be it extended deck space, additional or enlarged rooms, porch space or a bigger home, we can help make your home additions possible. Home additions should be tastefully done to enhance and blend in flawlessly with the existing property. Make your space more comfortable with an addition outdoors or indoors, with Cosmic as your contractor for the mission.
We are on site to ensure that you get the results you envisioned. Therefore you get the bigger better home you want, crafted by a crew aimed at catering to turning your desired home addition into a reality.
// Ready to take your house to the next level?

Talk to our team about our professional room additions and what they can do for your property.​

// ADU


// Room Additions

Adding Extra Space to Your Home?

The cost of adding to your home is dependent upon your vision for your home addition. As such, the cost can be minimal or exceed the cost of the entire home. If you wish to simply extend on the space available at your property, here are a few options of home additions you may be interested in.

An Additional Room - Bump-out

This type of home addition aims to extend the square footage of your home by adding an extra room to the property. Usually built on one side of the house, it is designated to have a single function, such as an additional bathroom or bedroom.
Because a bump-out is a small scale addition, it could also be adding to the square footage of an existing room. For example, adding an additional 50 square foot to your kitchen to increase storage and working area. These types of additions often call for a new roofline.

A Garage Conversion

If the home has a double or single garage which is not in use, it may be converted into an additional living space. Well this type of addition begins with a conversion from garage to become a bedroom or living room. The garage’s foundation, electricity, roof, concrete flooring and walls are already there as an invitation to start.
As the basic structure exists, this may seem a simple home addition. Yet such an addition calls for additional flooring, ceiling installation and replacing the garage door with a solid wall. Also, depending on the type of room conversion made, plumbing is another task to be undertaken.


These additions are usually made to the side of the home and serve as an auxiliary room. The sunroom is typically accessible from the main house through doors. Because this type of room is not meant to be a permanent sleeping area, various upgrades cannot be made during a home addition.
They are expected to have neither mandatory heating or cooling systems nor a kitchen or bathroom. Thermal resistant glass, aluminum and other pre-fabricated materials are often used for the construction of the sunroom. Yet to allow the sunroom to blend in with the general structure of the house, some sunrooms have been built using concrete, lumber and other materials used to build the house

Full-sized Home Additions

A full sized home addition usually accommodates more than one room and remains open to the main house. It is often constructed at a side of the house and if built properly, can become one with the house it is attached to. Unless this sort of addition is intended to be an apartment, full-sized home additions rarely include a kitchen.
This type of home additions normally contains one or more of the following, a family room, guest bedroom, dining room or master bedroom. Though rather costly, such a home addition actually adds to the overall value of the home.

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    // Your Project


    Our first step in home additions is to discuss what needs this new construction will meet. We want to design something as functional as it is beautiful. Then we practice what we call “complete planning.” We create a detailed 3D rendering and a full set of architectural drawings so you can review exactly what your home addition will look like.
    We don’t stop there, though — we select every single fixture, finish, and material prior to construction. Before we even break ground, you know every detail of the project. That way there won’t be any surprises.
    Additions are an excellent fit for our delivery method. Because there are so many elements of design used in creating the best possible space for your family, our thorough design approach allows us to fully plan your project and provide itemized budgets and construction schedules prior to lifting a finger in the actual construction.